EP0197825A1 - Echtzeit-Analyseschaltung der Pulsenergie-Verteilung eines impulsförmigen Signals - Google Patents

Echtzeit-Analyseschaltung der Pulsenergie-Verteilung eines impulsförmigen Signals Download PDF

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Publication number
EP0197825A1
EP0197825A1 EP86400579A EP86400579A EP0197825A1 EP 0197825 A1 EP0197825 A1 EP 0197825A1 EP 86400579 A EP86400579 A EP 86400579A EP 86400579 A EP86400579 A EP 86400579A EP 0197825 A1 EP0197825 A1 EP 0197825A1
Authority
EP
European Patent Office
Prior art keywords
code
memory
energy
counting
pulse
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP86400579A
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English (en)
French (fr)
Inventor
Jean Louis Lepetit
Jean Pierre Lepagnot
Emile Poussier
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Commissariat a lEnergie Atomique et aux Energies Alternatives CEA
Original Assignee
Commissariat a lEnergie Atomique CEA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Commissariat a lEnergie Atomique CEA filed Critical Commissariat a lEnergie Atomique CEA
Publication of EP0197825A1 publication Critical patent/EP0197825A1/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/17—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values giving an indication of the number of times this occurs, i.e. multi-channel analysers

Definitions

  • the present invention relates to a real-time analysis circuit of the energy distribution of the pulses of a pulse signal.
  • the energy distribution of the pulses is defined by counting the number of pulses falling in energy windows, or energy bands, predetermined.
  • This circuit allows in particular the analysis of the energy distribution of non-stationary physical phenomena, such as the radioactive decay of a radioactive body.
  • the mass of a radioactive body contained in a material made up of several elements can be determined by the rate of disintegration of this body.
  • the corpuscular or electromagnetic radiation associated with this disintegration has a perfectly defined energy.
  • Each disintegration being converted into an impulse, the counting of the impulses falling in an energy window centered on said disintegration energy makes it possible to evaluate the disintegration rate of this body.
  • the material comprises several radioactive bodies, the mass of each of these can be determined if the energy windows associated with these radioactive bodies are disjoint.
  • the counting rate in each energy window results from the superimposition of the decays of the radioactive body and the background noise due to cosmic radiation and to the terrain where the measurement is made.
  • This background noise is evaluated by counting the pulses falling in an energy window independent of the other energy windows and in which no decay due to a radioac body tif analyzed is not possible.
  • the actual decay rate of each radioactive body analyzed is thus determined by the counting rate in the associated energy window minus the counting rate due to background noise.
  • Known circuits for analyzing the energy distribution of the pulses of a pulse signal comprise an analog-digital converter delivering a digital code representative of the amplitude of the pulse received, a storage means comprising as many storage cells as possible values of the digital code, and processing means for incrementing the content of the storage cell associated with the digital code delivered by the analog-digital converter.
  • the information contained in each storage cell is representative of the energy distribution of the phenomenon measured.
  • This energy distribution is defined by the number of pulses per channel, or energy level.
  • the main object of the invention is to eliminate this dead time so that the energy distribution of the pulse signal by energy windows is available immediately after the end of the analysis of the measured signal.
  • the invention provides a set of n counting scales each corresponding to an energy window, the content of a counting scale being incremented When the amplitude of the pulse received is included in the energy band of the associated window. In this way, energy distribution by energy window is carried out in real time.
  • the content of a counting scale is incremented when the first code representing the amplitude of a pulse is between two determined values representing respectively the lower bound and the upper bound of the energy window.
  • a counting scale is associated with each energy window. However, it is also possible to associate several different energy windows with a single counting scale.
  • At least one value of the second code is associated with the energies outside the defined energy windows.
  • the memory used can in particular be a random access memory or a read-only memory, programmable or reprogrammable.
  • FIG. 1 schematically represents the analysis circuit of the invention.
  • This circuit includes an analog-digital converter 2, a coding means 4 and a set of counting scales 6 1 , 6 2 , ..., 6 n .
  • the analog-digital converter 2 receives the pulse signal. It delivers on a data channel 8 a first digital code representative of the ampLitude of a received pulse and on a control channel 10 a synchronization signal.
  • the first digital code can advantageously be a set of binary signals, for example a byte that can represent 256 amplitude levels.
  • the synchronization signal transmitted on channel 10 allows the reception of the code transmitted on channel 8 by the coding means 4.
  • the coding means 4 controls the incrementation of the content of one of the counting scales 6 1 , 6 2 , ... 6 n .
  • All the counting scales are associated with an energy window and are incremented when the energy of the pulse received by the analog-digital converter 2 is between the lower threshold and the upper threshold. of the energy band associated with said counting scale.
  • a determined counting scale can represent the energies external to the energy bands associated with the other counting scales. This last counting scale is thus incremented when the intensity of the received pulse does not correspond to one of the defined energy windows.
  • the use of this counting scale has the advantage that the sum of the values contained in all the counting scales is then equal to the sum of the pulses received by the circuit. This is essential for a precise statistical study of the energy distribution of the pulses of the received signal.
  • FIG. 2 illustrates the correspondence between the intensity of a pulse, the defined energy windows and the counting scales.
  • E i and E f The lower and upper energies of the energy band processed by the analysis circuit.
  • three disjoint energy windows F 1 , F 2 and F 3 have been defined in this band. This division reveals in Band [E i , E f ] three bands B 1 , B 2 and B 3 .
  • the analysis circuit has four counting scales 6 1 , 6 2 , 6 3 and 6 4 .
  • the first three counting scales are associated respectively with the three energy windows F 1 , F 2 and F 3 ;
  • the fourth counting scale is associated with bands B 1 , B 2 and B 3 .
  • FIG. 2 shows a pulse I whose ampLitude is between the energies E i and E f . More specifically, the ampLitude of this pulse is between the limits of the energy window F 2 .
  • the coding means of the circuit of the invention controls the incrementation tion
  • the scaler 6 2 associated with this fe- be n F 2.
  • FIG. 3 shows in detail the coding means of the circuit of the invention. It includes a memory 12 and a binary decoder 14.
  • the address input of Memory 12 is connected to Channel 8, its data output is connected by a channel 16 to The input of binary decoder 14.
  • the selection of The memory 12 is produced by the signal sent on channel 10.
  • the memory 12 includes at least N storage cells which are each associated with a given intensity of the received pulse. All cells corresponding to a specific energy window contain the same value. This transmitted by channel 16 to binary decoder 14, enables the output of the binary decoder associated with the counting scale which corresponds to this energy window. Thus, the content of the counting scale is incremented.
  • the applicant has produced an analysis circuit in accordance with FIGS. 1 and 3.
  • the analog-digital converter 2 is of the ADC 820 type, the memory 12 of the 6166L-5 type, the binary decoder of the HEF 4514 type and the counting scales are constituted by circuits 82C54 each containing three counting scales.
  • the first code issued on channel 8 is a byte and the second code, issued on channel 16, has 4 binary elements.
  • the analysis circuit of the invention comprises, in a conventional manner, means for sequencing signals between the different elements of the circuit. It can also advantageously include a processor, in particular when the memory is a random access memory (RAM) or a reprogrammable read-only memory (EPROM or EEPROM).
  • RAM random access memory
  • EPROM reprogrammable read-only memory

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Measurement Of Radiation (AREA)
  • Analogue/Digital Conversion (AREA)
EP86400579A 1985-03-25 1986-03-19 Echtzeit-Analyseschaltung der Pulsenergie-Verteilung eines impulsförmigen Signals Withdrawn EP0197825A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8504403 1985-03-25
FR8504403A FR2579328B1 (fr) 1985-03-25 1985-03-25 Circuit d'analyse en temps reel de la distribution energetique des impulsions d'un signal d'impulsions

Publications (1)

Publication Number Publication Date
EP0197825A1 true EP0197825A1 (de) 1986-10-15

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP86400579A Withdrawn EP0197825A1 (de) 1985-03-25 1986-03-19 Echtzeit-Analyseschaltung der Pulsenergie-Verteilung eines impulsförmigen Signals

Country Status (4)

Country Link
US (1) US4730157A (de)
EP (1) EP0197825A1 (de)
CA (1) CA1247245A (de)
FR (1) FR2579328B1 (de)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5043927A (en) * 1989-09-18 1991-08-27 Tektronix, Inc. Digital signal quality analysis using simultaneous dual-threshold data acquisition
US6806721B2 (en) * 2000-06-28 2004-10-19 The United States Of America As Represented By The Secretary Of The Navy Digital envelope detector
US7019509B2 (en) * 1997-05-30 2006-03-28 The United States Of America As Represented By The Secretary Of The Navy Digital envelope detector

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2806651A (en) * 1954-02-01 1957-09-17 Rca Corp Pulse amplitude analyzer
US2961641A (en) * 1958-03-19 1960-11-22 Schlumberger Well Surv Corp Pulse height analyzer apparatus

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, vol. BME-26, no. 7, juillet 1979, pages 436-440, IEEE, New York, US; S.J. RACKHAM et al.: "A pulse height analyzer for displaying coulter counter particle size distributions" *
IEEE TRANSACTONS ON NUCLEAR SCIENCE, vol. NS-16, no. 5, octobre 1969, pages 36-57, New York, US; B. SOUCEK: "State of art in multichannel pulse data analysis" *
NUCLEAR INSTRUMENTS & METHODS, vol. 121, no. 3, 1974, pages 567-572, North-Holland Publishing Co., Amsterdam, NL; G.E. O'BRIEN et al.: "A digital gate unit for two-parameter multichannel analysis" *
RADIO FERNSEHEN ELEKTRONIK, vol. 27, no. 9, septembre 1978, pages 583-586, Berlin, DD; D. LANGE: "Digitales Datenklassifiziergerät zur Aufnahme empirischer Verteilungen" *

Also Published As

Publication number Publication date
US4730157A (en) 1988-03-08
CA1247245A (en) 1988-12-20
FR2579328B1 (fr) 1987-10-23
FR2579328A1 (fr) 1986-09-26

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